 | Gregory Peck als Prof. David Pollock |
 | Sophia Loren als Yasmin Azir |
 | Alan Badel als Nejim Beshraavi |
 | Kieron Moore als Yussef Kasim |
 | Carl Duering als Prime Minister Hassan Jena |
 | John Merivale als Maj. Sylvester Pennington Sloane |
 | Duncan Lamont als Webster |
 | George Coulouris als Ragheeb |
 | Ernest Clark als Beauchamp |
 | Harold Kasket als Mohammed Lufti |
 | Windsor Davies als Policeman |
 | Jimmy Gardner als Helmsley |
 | Larry Taylor als Mustapha |
| Harry Locke als Zookeeper |
 | Michael Bilton als Microscope Salesman |
 | Jill Goldston als Ascort Racegoer (uncredited) |
| Stanley Donen | Director |
| Gordon Cotler | Novel |
| Stanley Donen | Producer |
| Henry Mancini | Original Music Composer |
| Christopher Challis | Director of Photography |
| Frederick Wilson | Editor |
| Reece Pemberton | Art Direction |
| Arthur Carroll | Production Director |
| Denis Holt | Associate Producer |
| David W. Orton | Production Manager |
| Eric Rattray | Assistant Director |
| Austin Dempster | Camera Operator |
| John M. Jordan | Second Unit Cinematographer |
| John W. Mitchell | Sound Mixer |
| C. Le Mesurier | Sound Mixer |
| Don Sharpe | Sound Editor |
| Connie Willis | Continuity |
| W.T. Partleton | Makeup Artist |
| Christian Dior | Costume Design |
| Maurice Binder | Title Designer |
| Julian Mitchell | Screenplay |
| Peter Stone | Screenplay |
| Stanley Price | Screenplay |
| Yves Saint Laurent | Costume Design |
